Padding IS-IS Hello Packets

You can use the isis hello padding command to configure IS-IS hello packet padding. Padding the hello packets promotes early error detection due to transmission problems with large frames or due to mismatched MTUs on adjacent interfaces.

When disabled (default), IS-IS hello packets are padded to the full MTU size until an adjacency is formed with the adjacent interface. After the adjacency is formed, the hello packets are no longer padded. When enabled, IS-IS hello packets are always padded.

isis hello padding

• Use to pad IS-IS hello packets to their full maximum transmission unit (MTU) size.
• Example

  host1(config-if)#isis hello padding

• Use the no version to restore the hello padding to its default, no padding.
• See isis hello padding

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